Grate-bar for forced-blast furnaces.



- No. 696,937. Patented Apr. 8, I902;

F. BURGEB & H. M. WILLIAMS. GRATE BAR FOR FORCED BLAST FURNACES.

(Applibation filed May 23, 1900.)

(No Model.)

2 Sheets-Sheet l.

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Patented Apr. 8, I902. F. BURGER & H. M. WILLIAMS. GRATE BAR FDR FORCED BLAST FURNACES.

(Application filed May 28, 1900.)

2 Sheets-Sheet 2.

(No Model.)

abtozwup UNITED STATES EN'r Prion.

FRANZ BURGER AND HENRY M. WILLIAMS, OF FORT YVAYNE, INDIANA' SAID BURGER ASSIGNOR OF ONE-HALF HIS RIGHT TO SAID WILLIAMS.

Y GRATE-BAR FOR FORCED-BLAST FURNACES.

$PECIFIGATION forming part of Letters Patent No. 696,937, dated April 8, 1902.

Application filed May 23,1900. Serial No. 17,731. (No model.)

To all whom it nuty concern;

Be it known that we, FRANZ BURGER and HENRY M. WILLIAMS, citizens of the United States, residing at Fort Wayne, in the county of Allen and State of Indiana, have invented certain new and useful Improvements in Grate-Bars for Forced-Blast Furnaces, of which the following is a specification.

Our invention relates to certain improvements in grates; and it consists in providing the separated grate-bars with air-channels and in combining air-conductors with the bars to direct currents of air upward through the channels of the bars, all as fully set forth hereinafter and as illustrated in the accompanying drawings, in which- Figure 1 is a longitudinal section of part of a steam-generator, showing the grate embodying our invention. Fig. 2 is a plan view showing at the left a plan of the grate-bars and at the right a plan of the conductors below the grate-bars. Fig. 3 is an enlarged View, in part section, illustrating the end of one of the grate-bars and the air-conductor and air-chamber adjacent thereto. Fig. 4. is a sectional elevation on the line i 4, Fig. 3;

Fig. 5, a plan View of part of one of the grate-- bars; and Fig. 6, a plan view of a grate-bar, illustrating a difierent form of air-channel.

The combustion-chamber C may be the fireplace of a steam-generator, as shown, or of any other character of heater and is provided with a grate consisting of a series of sepa rated bars D, each of which, instead of being slotted, as usual, is provided with a vertical central opening either in the form of a sinuous slot E, as shown in Figs. 1 to 5, or of a series of openings slotted or rounded,as shown in Fig. 6, and preferably enlarged toward the bottom and so contracted at the top as not to serve in any way for the passage of clinkers ashes.

l ings, the grate thus serving the purpose of an ordinary grate so far as the free discharge of ashes between the bars is concerned.

In order to supply the fuel with abundant oxygen and to secure that increased and better combustion which results from heating the oxygen,we make the grate-bars the means of heating streams of air and of conveying the same to the bottom of the fuel-bed. To this end we combine with the grate-bars a series of air-conductors or pipes G, each one of which extends longitudinally beneath each of the bars and is provided with orifices a; below the opening or openings in the bar above, so that the air discharged from the conductors G is directed upward through the channels in the bars and discharged into the fuelbed in a highly-heated condition, in consequence of the heat imparted from the hot bars, through the channels of which the air passes. The bars may be cast solid with the channels or openings therein or, as shown in Figs. 3 and 4:, each bar may consist of two pieces riveted together by rivets s, passing through the bars and through spacing-lugsi cast thereon. The air may be conducted to the conductors G in any suitable manner. As shown, there is an air-chamber H below and extending around the combustion-chamber O and with which the ends of the conducting-pipes G connect, as usual, and the air is admitted to this air-chamber through one or more pipes H. duced in any suitable manneras, for instance, by means of a pump or blast J, as shown in Fig. 1.

By making the slot or channel E tortuous, as shown in Figs. 2 and 5, the length is increased, a greater heating-surface is aiforded,

and there is less danger of clogging up by As a general thing the effect of the blast is to carry the ashes away from the said channels.

WVithout limiting ourselves to the precise construction and arrangement of parts shown, we claim as our invention-- 1. A grate consisting of separated gratebars each provided with a vertical central channel for the passage therethrough of air,

The air may be intro-- and air-conductors arranged beneath said bars in a position to direct a blast of air upward through said central channels, substantially as described. 7

2. A grate consisting of separated gratebars each provided with a vertical central channel having a tortuous opening at the top for the passage therethrongh of air, and airconductors arranged beneath the bars in a position to direct a blast of air upward through said channels, substantially as described.

3. In a grate, the combination of a series of grate-bars each. composed of two pieces connected together to form between them a vertical central channel for the passage of air,

and an air-conductor below each bar arranged to direct currents of air upward through the bars, substantially as described.

4. The combination in a grate, of a series of separated channeled bars, a series of airconductors below said bars, and an air pipe or chamber extending around the grate and communicating with the opposite ends of the air-cond uctors, substantially as set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

FRANZ BURGER. HENRY M. WILLIAMS. Witnesses:

GEO. D. CRANE, J. BURGER. 

